Concrete Curb Calculator

How this calculator works

The curb face is a rectangle in cross-section. Curb-and-gutter mode adds a second rectangular gutter section before multiplying the combined area by run length.

The measured volume and allowance-adjusted order volume are both shown so the added material remains auditable.

Real public-work profiles may include slopes, radii, depressed sections and specific reinforcement. Approximate those only with a verified equivalent area or a detailed takeoff.

Control example: 100 ft rectangular curb

A 6 × 12 in section has 72 in² of area, or 0.5 ft².

The raw volume is 50 ft³. With 10% allowance, order about 55 ft³ or 2.04 yd³.

Assumptions and limits

• Use the actual cross-section dimensions and run length from the project profile; confirm transitions and curved segments separately.
• Measurements describe one simple project geometry.
• Waste and package values are editable planning assumptions.
• It does not select a local curb standard, reinforcement, control joints, drainage slope, forms, subbase, or ADA geometry.

Common measuring mistakes

• Mixing nominal dimensions with actual installed coverage.
• Skipping whole-package or stock-length rounding.
• Failing to verify the page’s stated measurement and product assumptions.
• Using a planning estimate outside the limitations stated on this page.

Sources

Product-specific values remain editable. These sources support the method and stated examples; they are not a universal substitute for your supplier’s current label.

• GQ Calc methodology Documents cross-section-times-length geometry, unit conversion and final rounding.
• QUIKRETE Concrete Mix data sheet Provides package yield when the calculated curb volume will be converted to bags.

Questions people ask